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| 型号： | LT1513IR#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR CONST/PROG I/V 7DD |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 2.7 V ~ 25 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-8，D²Pak（7 引线+接片），TO-263CA |
| 供应商设备封装： | D2PAK-7 |
| 包装： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LT1513/LT1513-2
APPLICATIO N S I N FOR M ATIO N
I IN = 4 mA +
current Schottky diodes have relatively high leakage cur-
rents (5 μ A to 500 μ A) even at room temperature. The latest
very-low-forward devices have especially high leakage cur-
rents. It has been noted that surface mount versions of some
Schottky diodes have as much as ten times the leakage of
their through-hole counterparts. This may be because a low
forward voltage process is used to reduce power dissipation
in the surface mount package. In any case, check leakage
vary depending on the mounting technique (copper area,
airflow, etc.).
Average supply current (including driver current) is:
(V BAT )(I CHRG )(0.024)
V IN
Switch power dissipation is given by:
( I CHRG ) ( R SW )( V BAT + V IN )( V BAT )
specificationscarefullybeforemakingafinalchoiceforthe
switching diode. Be aware that diode manufacturers want
to specify a maximum leakage current that is ten times
P SW =
2
( V IN ) 2
higher than the typical leakage. It is very difficult to get them
to specify a low leakage current in high volume production.
This is an on going problem for all battery charger circuits
and most customers have to settle for a diode whose typical
leakage is adequate, but theoretically has a worst-case
condition of higher than desired battery drain.
Thermal Considerations
Care should be taken to ensure that worst-case conditions
do not cause excessive die temperatures. Typical thermal
resistance is 30 ° C/W for the R package but this number will
GROUND PLANE
R SW = Output switch ON resistance
Total power dissipation of the die is equal to supply current
times supply voltage, plus switch power:
P D(TOTAL) = (I IN )(V IN ) + P SW
For V IN = 10V, V BAT = 8.2V, I CHRG = 1.2A, R SW = 0.3 ? ,
I IN = 4mA + 24mA = 28mA
P SW = 0.64W
P D = (10)(0.028) + 0.64 = 0.92W
V BAT
+
+
LT1513 TAB AND GROUND
C1
C1
D1
PIN SOLDERED TO
GROUND PLANE
C2
C5
R5
+
L1A
2 WINDING
INDUCTOR
L1B
R3
C3
C1,C3,C5 AND R3
TIED DIRECTLY TO
GROUND PLANE
LT1513 ? F04
V IN
Figure 4. LT1513 Suggested Partial Layout for Critical Thermal and Electrical Paths
sn1513 1513fas
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1513IT7 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Battery Management |
| LT1513IT7-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| LT-1514-110-006 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1514-110-012 | 制造商:Carling Technologies 功能描述:SINGLE-POLE, LIGHTED TOGGLE, RED LENS - Bulk |
| LT-1514-110-024 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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